﻿using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace CPPEI.BD.VMTool.Until
{
    public static class AppRunOneHelper
    {
        ///<summary>
        /// 该函数设置由不同线程产生的窗口的显示状态
        /// </summary>
        /// <param name="hWnd">窗口句柄</param>
        /// <param name="cmdShow">指定窗口如何显示。查看允许值列表，请查阅ShowWlndow函数的说明部分</param>
        /// <returns>如果函数原来可见，返回值为非零；如果函数原来被隐藏，返回值为零</returns>
        [DllImport("User32.dll")]
        public static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);


        /// <summary>
        ///  该函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号。
        ///  系统给创建前台窗口的线程分配的权限稍高于其他线程。 
        /// </summary>
        /// <param name="hWnd">将被激活并被调入前台的窗口句柄</param>
        /// <returns>如果窗口设入了前台，返回值为非零；如果窗口未被设入前台，返回值为零</returns>
        [DllImport("User32.dll")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("User32.dll", EntryPoint="FindWindow")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);



        private const int SW_SHOWNOMAL = 1;
        private const int SW_SHOWNOACTIVATE = 4;

        public static void HandleRunningInstance(Process instance)
        {
            IntPtr existWindowHandle = FindWindow(null, "视频矩阵切换");
            //System.Windows.MessageBox.Show(existWindowHandle.ToString());
            if (existWindowHandle == IntPtr.Zero)
            {
                existWindowHandle = instance.MainWindowHandle;
            }
            bool result = ShowWindow(existWindowHandle, SW_SHOWNOMAL);
            //System.Windows.MessageBox.Show(instance.MainWindowHandle.ToString() );//+ ":" + result.ToString());
            SetForegroundWindow(existWindowHandle);//当到最前端
        }

        public static Process RuningInstance()
        {
            Process currentProcess = Process.GetCurrentProcess();
            Process[] Processes = Process.GetProcessesByName(currentProcess.ProcessName);

            foreach (Process process in Processes)
            {
                if (process.Id != currentProcess.Id)
                {
                    return process;
                }
            }


            return null;
        }

    }
}
